arXiv:hep-lat/0409082·v1·High Energy Physics — Lattice
Analysis of spectra using matrices of correlation functions based on irreducible baryon operators
LHP Collaboration: S. Basak · I. Sato · S. Wallace (UMD) · R. Edwards · G.T. Fleming · D. Richards (JLab) · R. Fiebig (FIU) · U.M. Heller (APS) · C. Morningstar (CMU)
Abstract
We present results for ground and excited-state nucleon masses in quenched lattice QCD using anisotropic lattices. Group theoretical constructions of local and nonlocal straight-link irreducible operators are used to obtain suitable sources and sinks. Matrices of correlation functions are diagonalized to determine the eigenvectors. Both chi-square fitting and Bayesian inference with an entropic prior are used to extract masses from the correlation functions in a given channel. We observe clear separation of the excited state masses from the ground state mass. States of spin >= 5/2 have been isolated by use of G_2 operators.
Comments: Lattice2004 (spectrum)